package com.chif.mapreduce.compress;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;

import java.io.IOException;

public class WordCountMapper extends Mapper<LongWritable, Text,Text, IntWritable> {

    //懒汉式
    Text k = new Text();
    IntWritable v = new IntWritable(1);

    /**
     * map()方法(MapTask进程)对每一个<K,V>调用一次
     * @param key
     * @param value
     * @param context
     * @throws IOException
     * @throws InterruptedException
     */
    @Override
    protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {

        //1 获取一行
        String line = value.toString();

        //2 切割
        String[] words = line.split(" ");

        //3 输出
        for (String word : words) {
            k.set(word);
            context.write(k,v);
        }

    }
}
